Here's a summary of my symptoms:

in late august-- I woke up to find two itchy red bumps that seemed like bug bites on my buttocks, one on each cheek. They were really itchy and I figured they'd go away on there own. But it seemed like every other day or so i'd develop 2 more, until I had about 6 of them, mainly on one buttcheek. They were so itchy and annoying. They went away within a week or so, and now they're scars.

A few weeks ago, I noticed a tiny red dot on my buttocks, which didn't seem like a big deal since I get them often. However the next morning, it was larger, filled with puss...And it burst. Now once in a while i'll notice that a tiny red dot will do the same thing--it'll grow ( kind of like a really mature pimple, and heal). This morning I noticed one, put neosporin on it and after a few hours, the size was reduced to almost nothing...Like the red dot it began as.
I thought I might have herpes and got everything checked out and got a blood test, and the results came back as negative.

There are some factors:
a) my roommate has a cat who goes outside..So it might be fleas??
B) but why then, is it only on my buttocks?

Does anyone know what this might sound like? Sometimes ( usually each week or so) I get a tiny pimple, which grows and practically dissappears in a day. And there's not pain....

Sooooooooo...If you know anything or have similar symptoms let me know!!